fix: prevent overlapping environment variables

cmd/client/client.go

@@ -16,9 +16,9 @@ func main() {
 	defer logger.Sync()
 
 	config.LoadConfig(file.Provider("config.json"), json.Parser())
-	config.LoadConfig(env.Provider("GOINV_", ".", func(s string) string {
+	config.LoadConfig(env.Provider("GOINV_CLI_", ".", func(s string) string {
 		return strings.Replace(strings.ToLower(
-			strings.TrimPrefix(s, "GOINV")), "_", ".", -1,
+			strings.TrimPrefix(s, "GOINV_CLI_")), "_", ".", -1,
 		)
 	}), nil)